Github user davebshow commented on the issue:
https://github.com/apache/tinkerpop/pull/478
Well I implemented this API for gremlin-python. There is one major problem:
side effects. Since the current side effect API is designed to be synchronous
(calling `run_sync`), it cannot be used inside a coroutine, as demonstrated by
this
[test](https://github.com/apache/tinkerpop/blob/54fac5146a5ac067e75f2fbfe135fae2da641c35/gremlin-python/src/main/jython/tests/driver/test_driver_remote_connection.py#L210).
This is problematic for a Tornado or Asyncio based driver. I think in the
future we should consider the possibility that the `promise()` method return a
`AsyncSideEffect` object so the end user can leverage the async techniques with
side effects.
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